S149-01-880 Issue F
Page 30 © Edwards Limited 2011. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.7 Belt maintenance
z Lockout all energy sources connected to the pump and vent to atmosphere.
z Remove the belt guard cover.
z Test the belt tension with proper tester.
Note: New belts usually lose some tension during initial operation and should be re-checked during the first few
days of operation. Always tension the belts according to the specifications of the belt manufacturer.
excessive tension can induce unnecessary loading on the pump and motor bearings, while extreme over-
tensioning may cause the shaft to break as a result of fatigue.
z Replace worn pulleys.
z Replace all belts at one time when any one requires changing. Check tension frequently during the first few
days of operation. Never apply belt dressing. If customer supplied belt or pulleys are used, follow the
manufacturer's recommended installation procedures.
z Reinstall belt guard cover.
z Check the pump and system for potential hazardous conditions. Restore energy sources.
5.8 Drive belt tension
Remove the belt guard. At approximately the center of the span between drive and driven pulleys, apply force to the
belt and ensure the resulting deflection provided in Table 6.
If necessary, adjust the tension by raising or lowering the nuts on the motor support jack screws. Tighten the
jackscrew nuts securely after adjustment is complete.
Note: Maintenance of proper belt tension is important. Excessive over-tightening of the belts is harmful to the
shaft bearings, while under-tightening will allow the belts to slip.
5.9 Gas ballast check valve replacement
z Replace the gas ballast valve(s) every two (2) years, if gas ballast is used on a regular basis.
z Lockout all energy sources connected to the pump.
z Remove the stem valve.
z Use an O-ring pick or suitable tool to pull out the gas ballast check valve. Replace the valve if the spring is
damaged or broken.
z Reinstall the stem valve.
z Check the pump and system for potential hazardous conditions. Restore energy sources.
Table 6 - Belt tension
Pump Force Deflection
NPoundsmmInches
149-H/149-HS 13.3 - 22.2 3 - 5 11.0 7/16
212-J 13.3 - 22.2 3 - 5 11.0 7/16
412-J 22.2 - 31.2 5 - 7 13.0 1/2
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